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Date: Thu, 03 Oct 2013 17:20:17 -0600 From: Thavatchai Makphaibulchoke <thavatchai.makpahibulchoke@...com> To: Andreas Dilger <adilger@...ger.ca> CC: T Makphaibulchoke <tmac@...com>, Theodore Ts'o <tytso@....edu>, "linux-ext4@...r.kernel.org List" <linux-ext4@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, aswin@...com Subject: Re: [PATCH 0/2] fs/ext4: increase parallelism in updating ext4 orphan list On 10/03/2013 06:28 PM, Andreas Dilger wrote: > > It would also be possible to have a completely contention-free orphan > inode list by only generating the on-disk orphan linked list in a > pre-commit callback hook from an efficient in-memory list. That would > allow the common "add to orphan list; do something; remove from list" > operations within a single transaction to run with minimal contention, > and only the few rare cases of operations that exceed the lifetime of > a single transaction would need to modify the on-disk list. > > For example, a per-cpu list would be quite efficient, or a hash table. > Then, a jbd2 callback run before the transaction commits could modify > the requisite inodes and superblock. All of those inodes are already > (by definition) part of the transaction, so it won't add new buffers > of the transaction. > > I'm not necessarily against the current patch, just thinking aloud about > how it might be improved further. > > Cheers, Andreas > Thanks again for the suggestion. I'll rework this patch first and look into this possibility next. Thanks, Mak. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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